title: Multifunctional free-standing membrane from the self-assembly of ultralong MnO2 nanowires.
abstract: In this work, we report the preparation of a free-standing membrane with strong mechanical stability and flexibility through a facile vacuum filtration approach. A field-emission scanning electron microscopy image demonstrates that the membrane composed of MnO2 nanowires is 50 nm in width and up to 100 μm long and the nanowires are assembled in parallel into bundles. A possible formation mechanism for the ultralong nanowires and the free-standing membrane has been proposed. Meanwhile, the properties of the membrane could be controlled by incorporating different materials to achieve composite membranes. In order to demonstrate the broad applicability of the MnO2 membrane, we fabricate a variety of composite membranes exhibiting various novel properties including magnetism and reversibly switchable wettability between hydrophilicity and hydrophobicity through various material modification, including CoFe2O4 nanoparticles and organic triethoxy(octyl)silane. Furthermore, the free-standing membrane could also simultaneously be functionalized with two materials, which reveal multiple properties. The synthesis method of a free-standing MnO2 membrane is simple and environmentally friendly, and it is easily scalable for industry. These composite membranes constitute a significant contribution to advanced technology.
authors.affiliation: School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, People's Republic of China.
authors.forename: Bang
authors.initials: B
authors.lastname: Lan
authors.forename: Lin
authors.initials: L
authors.lastname: Yu
authors.forename: Ting
authors.initials: T
authors.lastname: Lin
authors.forename: Gao
authors.initials: G
authors.lastname: Cheng
authors.forename: Ming
authors.initials: M
authors.lastname: Sun
authors.forename: Fei
authors.initials: F
authors.lastname: Ye
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Sun
authors.forename: Jun
authors.initials: J
authors.lastname: He
mesh_terms: D015374:Biosensing Techniques; D002384:Catalysis; D057927:Hydrophobic and Hydrophilic Interactions; D046911:Macromolecular Substances / Q000737:chemistry; D008280:Magnetics; D017895:Manganese Compounds / Q000737:chemistry*; D008422:Materials Testing; D008567:Membranes, Artificial; D046529:Microscopy, Electron, Transmission / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry; D036103:Nanotechnology / Q000379:methods; D053770:Nanowires / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D014867:Water / Q000737:chemistry; D017155:Wettability; D014961:X-Ray Diffraction
chemical_list: D046911:Macromolecular Substances; D017895:Manganese Compounds; D008567:Membranes, Artificial; D010087:Oxides; D014867:Water; C027424:manganese oxide; D010100:Oxygen